little



G. LITTLE.

Improvement in Telegraph Apparatus.

NO. 130,811. Patented Aug. 27. T872A granted to me.

LITTLE, OF RUTHERFORD PARK, EEVV JERSEY.

lMPROlEdENT iN TELEGRAPH APPARATUS.

Specification forming part of Letters Patent No. ESQLSIE., dated August 27, 1672.

To all whom it may concern:

Be it known that I, GEORGE IirTTLE, of Rutherford Iarlr, in the county of Bergen and State oi New Jersey, have invented an Inr provement in Electro-Magnetic Apparatus for Telcgraphic Purposes; and the following is declared to be a correct description of the same.

This invention consists in an electro-magnet adapted to moving an armature for producing sound, or for making or breaking a telegraphic circuit by the action of magnetism without the use of a si 1ing or retractile force applied to such armature, the motion being due to electrical attraction and repulsion. I make use of two helices around the soit-iron core, and these helices are so wound and connected with the main line and a local or constant circuit that when there is a pulsation in the main line the polarity of the electro-magnet will be changed and produce a movement in the armature which is polarized.

In the drawing, Figure 1 is a plan of the instrument. Fig. 2 is an elevation of the same; and Fig. 3 is a plan ofthe helices and electromagnet as removed from the rheostats, Fig. 1, and the connections from those helices to the respective parts of the rheostats are indicated by dotted lines. l

The armature a is hung upon the centers b, so as to swing or vibrate in any convenient manner. I have shown the frame c for sustaining the saine. rIlhe extent oi vibration is determined by a stop or stops. The stop d is shown as an adj Listing-screw, and by the vibration of that armature sound may be produced or a local or relay circuit opened or closed. r1`he electro-magnet c is shown. of the ordinary U-shape. It might, however, be a single bar with two spools upon it. I have shown the spools or helices f g h t'. These are separate, and wound with reference to producing thereverse polarity, as hereafter set forth. These spools are oi' a size to pass freely into the coilcylinders Z m ci the rheostats. The heads 1 2 3 a are at the ends of the respective rheostatcoils, and the adjustcrs a n are made so as to be moved upon the bars o o, and adjust the action oi' the respective rheostats in dividing the electric current, as in patents* heretofore The P and N wires of the main line are connected to the heads l and 2, and

the P and N wires of the local or constant battery s are connected to the heads 3 and 4. The other connections are indicated by the dotted lines, and the electric circuits are as follows: The constant, e, being connected to 3 and 4, the current is divided, a portion going from 3 by the adjuster a', rheostat-coil m, and head 4, baci; to the battery, and the regulated proportion passing from 23, by a wire, to the helix h; thence through the helix t baclr aga-in to the head el and battery. By the helices It i the cores e are maguetized and attract the armature a, (or the reverse hence the action of the local constant battery is to hold the armature a toward the cores e. Vvhen a pulsation passes along the main-line circuit it enters by the head 2, is divided, a portion going by the rheostat-coill to the head 1 and line-wire, while the other portion goes through the helix g, helixf, and wire back to the head 1 to the line wire. The helices j' andy are wound in such a manner that the main-line current will incite in the cores e magnetism or' opposite polarity .this polarization of the armature may result from permanent magnetism or from electro magnetism, said armature being within an electromagnetic helix. It' desired, the main-line pulsation may pass through the helices h t in the opposite direction to that from the constant, so as to neutralize the action ot' these helices on the cores e in a manner similar to that set forth in Letters Patent granted to me Decem ber 26, 1871, No. 122,266, or the portion of the current from e may be small so that the mainline current acting in j" g shall overcome and reverse the magnetism in the cores from t and i. The elcctromagnets f g h i might be separate from the rheostats instead of being introduced within them; but by availin g of the space in the rheostat for receiving an electromagnet or magnets the instrument is rendered much more compact than heretofore.

I claim as my inventionl. .A soft-iron core and two helices, one iu the main line and the other in a local constant binationwit-h the electro-magnets and polarized circuit, and arranged, as set forth, to produce` armature, substantially as set forth.

opposite polarity in the core, in combination Signed by me this 22d day of March, A. D. with an armature that is polarized, for the pur- 187 2.

, poses and substantially as set forth. GEO. LITTLE.

2. An electro-magnet introduced within a n rheostat, substantially as set forth. Witnesses:

3. The rheostat in the main line and the CEAS. H. SMITH,

rheostat in the local constant circuit, in com- GEO. T. PINCKNEY. 

